This entire single-file HTML application is hosted directly on Nostr (NIP-5A nsite) and Blossom.
There is zero backend server or database: the DOM is the database, and edits are signed with BIP-340 Schnorr signatures.
npub1rd5gvak0r4ufs62rn4af0605pjaru0ttgtpg20v4m09kknqe9j5qxe4c4u